| year | team | league | level | age | pos | g | gs | inn | po | a | e | dp | tc | tsc | sb | cs | sb% | fpct | rfg | rfi | rf9i | tm share | pl share | tm rank |
| 1983 | Niagara Falls Sox | NYPL | A- | 20 | P | 16 | 0 | 0.0 | 8 | 13 | 4 | 2 | 25 | 21 | 0 | 0 | .840 | 1.3 | 0.00 | 0.00 | 21.6 | 100.0 | 7 | |
| 1984 | Glens Falls White Sox | East | AA | 21 | P | 19 | 0 | 0.0 | 10 | 11 | 1 | 0 | 22 | 21 | 0 | 0 | .955 | 1.1 | 0.00 | 0.00 | 13.8 | 100.0 | 10 | |
| 1984 | Nashville Sounds | Sou | AA | 21 | P | 4 | 0 | 0.0 | 2 | 3 | 2 | 1 | 7 | 5 | 0 | 0 | .714 | 1.3 | 0.00 | 0.00 | 2.7 | 100.0 | 18 | |
| 1984 | Appleton Foxes | Midw | A | 21 | P | 1 | 0 | 0.0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 1.000 | 1.0 | 0.00 | 0.00 | 0.7 | 100.0 | 17 | |
| 1985 | Albany/Colonie Yankees | East | AA | 22 | P | 26 | 0 | 0.0 | 10 | 25 | 3 | 1 | 38 | 35 | 0 | 0 | .921 | 1.3 | 0.00 | 0.00 | 18.7 | 100.0 | 7 | |
| 1986 | New York Yankees | AL | MLB | 23 | P | 27 | 21 | 131.2 | 5 | 13 | 0 | 0 | 18 | 18 | 3 | 4 | 0.4286 | 1.000 | 0.7 | 0.14 | 1.26 | 16.7 | 100.0 | 7 |
| 1986 | Columbus Clippers | IL | AAA | 23 | P | 8 | 0 | 0.0 | 4 | 6 | 0 | 1 | 10 | 10 | 0 | 0 | 1.000 | 1.3 | 0.00 | 0.00 | 5.8 | 100.0 | 15 | |
| 1987 | Pittsburgh Pirates | NL | MLB | 24 | P | 29 | 28 | 176.1 | 24 | 23 | 2 | 0 | 49 | 47 | 13 | 12 | 0.52 | .959 | 1.6 | 0.27 | 2.43 | 17.9 | 96.7 | 6 |
| 1988 | Pittsburgh Pirates | NL | MLB | 25 | P | 33 | 32 | 219.1 | 29 | 21 | 6 | 6 | 56 | 50 | 13 | 10 | 0.5652 | .893 | 1.5 | 0.23 | 2.07 | 20.6 | 100.0 | 6 |
| 1989 | Pittsburgh Pirates | NL | MLB | 26 | P | 35 | 34 | 244.1 | 24 | 34 | 2 | 0 | 60 | 58 | 24 | 9 | 0.7273 | .967 | 1.7 | 0.24 | 2.16 | 21.6 | 87.5 | 6 |
| 1990 | Pittsburgh Pirates | NL | MLB | 27 | P | 33 | 33 | 231.1 | 25 | 36 | 1 | 1 | 62 | 61 | 18 | 9 | 0.6667 | .984 | 1.8 | 0.26 | 2.34 | 20.4 | 100.0 | 7 |
| 1991 | Pittsburgh Pirates | NL | MLB | 28 | P | 35 | 35 | 234.2 | 27 | 41 | 5 | 1 | 73 | 68 | 29 | 15 | 0.6591 | .932 | 1.9 | 0.29 | 2.61 | 21.6 | 97.2 | 7 |
| 1992 | Pittsburgh Pirates | NL | MLB | 29 | P | 34 | 34 | 256.2 | 29 | 36 | 3 | 4 | 68 | 65 | 18 | 14 | 0.5625 | .956 | 1.9 | 0.25 | 2.25 | 21.0 | 97.1 | 7 |
| 1993 | Houston Astros | NL | MLB | 30 | P | 34 | 34 | 237.2 | 19 | 32 | 0 | 2 | 51 | 51 | 28 | 7 | 0.8 | 1.000 | 1.5 | 0.22 | 1.98 | 21.0 | 100.0 | 6 |
| 1994 | Houston Astros | NL | MLB | 31 | P | 23 | 23 | 164.2 | 21 | 28 | 3 | 2 | 52 | 49 | 13 | 5 | 0.7222 | .942 | 2.1 | 0.30 | 2.70 | 20.0 | 95.8 | 10 |
| 1995 | Houston Astros | NL | MLB | 32 | P | 31 | 31 | 185.0 | 24 | 20 | 2 | 3 | 46 | 44 | 21 | 10 | 0.6774 | .957 | 1.4 | 0.24 | 2.16 | 21.5 | 93.9 | 7 |
| 1996 | Houston Astros | NL | MLB | 33 | P | 30 | 30 | 175.1 | 17 | 23 | 3 | 0 | 43 | 40 | 19 | 7 | 0.7308 | .930 | 1.3 | 0.23 | 2.07 | 18.5 | 93.8 | 7 |
| 1997 | Chicago White Sox | AL | MLB | 34 | P | 31 | 31 | 169.1 | 14 | 20 | 1 | 0 | 35 | 34 | 15 | 7 | 0.6818 | .971 | 1.1 | 0.20 | 1.80 | 19.3 | 100.0 | 9 |
| 1998 | Baltimore Orioles | AL | MLB | 35 | P | 23 | 21 | 108.2 | 8 | 15 | 1 | 1 | 24 | 23 | 16 | 3 | 0.8421 | .958 | 1.0 | 0.21 | 1.89 | 14.2 | 100.0 | 12 |
| 1998 | Bowie Baysox | East | AA | 35 | P | 1 | 0 | 0.0 | 1 | 1 | 0 | 0 | 2 | 2 | 0 | 0 | 1.000 | 2.0 | 0.00 | 0.00 | 0.7 | 100.0 | 27 | |
| Tot: | MLB (13 yrs) | MLB | P | 398 | 387 | 2,530.8 | 266 | 342 | 29 | 20 | 637 | 608 | 230 | 112 | 0.6725 | .954 | 1.5 | 0.24 | 2.16 | |||||
| Tot: | AAA (1 yrs) | AAA | P | 8 | 0 | 0.0 | 4 | 6 | 0 | 1 | 10 | 10 | 0 | 0 | 1.000 | 1.3 | ||||||||
| Tot: | AA (3 yrs) | AA | P | 50 | 0 | 0.0 | 23 | 40 | 6 | 2 | 69 | 63 | 0 | 0 | .913 | 1.3 | ||||||||
| Tot: | A (1 yrs) | A | P | 1 | 0 | 0.0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 1.000 | 1.0 | ||||||||
| Tot: | A- (1 yrs) | A- | P | 16 | 0 | 0.0 | 8 | 13 | 4 | 2 | 25 | 21 | 0 | 0 | .840 | 1.3 |
| year | category | pos P | pos C | pos 1B | pos 2B | pos 3B | pos SS | pos LF | pos CF | pos RF | pos OF | pos DH |
| 1983 | Minor | 16 | - | - | - | - | - | - | - | - | - | - |
| 1984 | Minor | 24 | - | - | - | - | - | - | - | - | - | - |
| 1985 | Minor | 26 | - | - | - | - | - | - | - | - | - | - |
| 1986 | Minor | 8 | - | - | - | - | - | - | - | - | - | - |
| 1986 | MLB | 27 | - | - | - | - | - | - | - | - | - | - |
| 1987 | MLB | 29 | - | - | - | - | - | - | - | - | - | - |
| 1988 | MLB | 33 | - | - | - | - | - | - | - | - | - | - |
| 1989 | MLB | 35 | - | - | - | - | - | - | - | - | - | - |
| 1990 | MLB | 33 | - | - | - | - | - | - | - | - | - | - |
| 1991 | MLB | 35 | - | - | - | - | - | - | - | - | - | - |
| 1992 | MLB | 34 | - | - | - | - | - | - | - | - | - | - |
| 1993 | MLB | 34 | - | - | - | - | - | - | - | - | - | - |
| 1994 | MLB | 23 | - | - | - | - | - | - | - | - | - | - |
| 1995 | MLB | 31 | - | - | - | - | - | - | - | - | - | - |
| 1996 | MLB | 30 | - | - | - | - | - | - | - | - | - | - |
| 1997 | MLB | 31 | - | - | - | - | - | - | - | - | - | - |
| 1998 | Minor | 1 | - | - | - | - | - | - | - | - | - | - |
| 1998 | MLB | 23 | - | - | - | - | - | - | - | - | - | - |